VRay GPU Stereoscopic *show stopper* bug?

[GregoryVFX]

Has anyone tried rendering a left-right stereo frame using VRay GPU lately?
I get instant Max crash the moment the render is finished, even on simple scenes with a teapot and a light.


Using the latest Vray Next, update 2.1 (4.20.90.29583), with latest Max 2020.2

Anyone else?

Thanks,
Greg

[GregoryVFX]

Attached is a simple scene illustrating the problem; load and render away.
Basically, this will crash Max the moment the render finishes.

For a weird reason it crashes on every render resolution selected, except 640 x 480!
Hope this helps...

Greg

[GregoryVFX]

On the same note, VRay Stereoscopic Helper doesn't do anything when rendering with VRayGPU.
I have to use only the Stereoscopic rendering parameters on the Render Setup Settings tab, which crash Max every time.

[GregoryVFX]

Anyone?
I'm stuck here, as going back to CPU is not an option as i get 40 min per frame, instead of 6 min per frame using GPU.
Running out of options, as default Max's Stereo Assembly Camera tool, doesn't seem to work with Vray GPU either; only renders the center camera through the Batch render dialog.

Edit: One way to bypass the show stopper bug, is to render a still with GPU, re-project that on the same geo and render with CPU in stereo...

[yavor.rubenov]

Hello,

I'm trying to reproduce the issue but with your scene, the same Max and V-Ray version I get no crash.
When Max crashes - it must create a crash dump - 3dsmax_minidump.dmp located in your temp folder (type %temp% in the Windows explorer address bar). Can you share it ?

What is your GPU and what driver version are you using ?
Can you try just for the test to render with only the C++/CPU CUDA device ?

Best regards,
Yavor

[GregoryVFX]

Hey Yavor...

Thanks for looking at this!
I just checked that scene here at the office and i hate to admit but i got no crash here either!

Must be something on my PC at home then, where i'm using an RTX 2080Ti, with 436.48 nVidia drivers.
I will investigate more when i'm back; i do get a warning though about the driver, been newer than the "recommended" one.
But, the crash only happens after the rendering is finished and the moment Max comes back.
I will check for that minidump as well..

Thanks so much!
Greg

[GregoryVFX]

Hello,

I'm trying to reproduce the issue but with your scene, the same Max and V-Ray version I get no crash.
When Max crashes - it must create a crash dump - 3dsmax_minidump.dmp located in your temp folder (type %temp% in the Windows explorer address bar). Can you share it ?

What is your GPU and what driver version are you using ?
Can you try just for the test to render with only the C++/CPU CUDA device ?

Best regards,
Yavor

Attached is the minidump from the crashing pc at home.
Also, crashing all the same, using only CPU CUDA device.

Edit: No luck with any version of VRay. Maybe something to do with my nVidia DCH driver?

Hope that minidump throw some light as the reason behind the constant crash.

[yavor.rubenov]

Sorry for the delay.

According to the crash dump - the crash happens inside the VFBPlus plugin - maybe it doesn't handle the fact the resolution doubles ?
Can you try to remove it and see if the render still crashes ?

Best regards,
Yavor

[GregoryVFX]

Sorry for the delay.

According to the crash dump - the crash happens inside the VFBPlus plugin - maybe it doesn't handle the fact the resolution doubles ?
Can you try to remove it and see if the render still crashes ?

Best regards,
Yavor

Alright, thanks for the heads up!
I will remove that tonight and try again.

But, i do use the same plugin in my PC at work and i get no crashes there with the same scene; weird.

[GregoryVFX]

Hey Yavor...
Thanks for the help.
Removing VFB+ fixed the crash; no idea why, as the same setup in the office doesn't crash and works fine.

At least i can work away now...

Thanks again!
Greg

[yavor.rubenov]

You are welcome

You could send the dump to the VFB+ developers and they might be able to tell what is the problem.